I'm curious about the design goals for having two bushing locations. Yes, the 2.5" separation may be useful for drilling matched holes in some limited number of applications, but in general it seems the DJ-1 is all about using one of the bushing locations.

Have you ideas for the second bushing location? What were the thoughts about its utility when DJ-1 was designed?

I'm interested in drilling accurately spaced holes for things like drawer pulls and wish to avoid multiple measuring and marking of pairs of holes.
I really like the philosophy of putting work into jigs and fixtures to eliminate repeated measurement.

I can design something to fixture into DJ-1 using the otherwise unused bushing location and provide an adjustable slide with an alignment pin to locate in the first hole drilled. In use, the first of 'N' drawer front mounting holes would be drilled with one fixturing (will make an adjustable side stop so DJ-1 positions a hole a settable distance from one end of a drawer front), then the adjustable slide with pin to fit the first hole is inserted and the location of the second hole is accurately spaced.

I am in the commercial Cabinet/Millwork industry and all our cabinet is "euro" style which means they use the 32mm system. If I am not mistaken the distance between each bushing is 64mm. Half of that is 32mm. Just that aspect of the tool can make it very useful for people who use the 32mm system.